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uas: Move uas detect code to uas-detect.h 

This is a preparation patch for teaching usb-storage to not bind to
uas devices.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Hans de Goede 2013-10-21 08:53:31 +01:00 committed by Sarah Sharp
parent e1be067b68
commit 82aa0387d5
2 changed files with 42 additions and 38 deletions
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40
drivers/usb/storage/uas-detect.h Normal file
View File

@ -0,0 +1,40 @@
#include <linux/usb.h>
#include <linux/usb/hcd.h>
static int uas_is_interface(struct usb_host_interface *intf)
{
return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE &&
intf->desc.bInterfaceSubClass == USB_SC_SCSI &&
intf->desc.bInterfaceProtocol == USB_PR_UAS);
}
static int uas_isnt_supported(struct usb_device *udev)
{
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
dev_warn(&udev->dev, "The driver for the USB controller %s does not "
"support scatter-gather which is\n",
hcd->driver->description);
dev_warn(&udev->dev, "required by the UAS driver. Please try an"
"alternative USB controller if you wish to use UAS.\n");
return -ENODEV;
}
static int uas_find_uas_alt_setting(struct usb_interface *intf)
{
int i;
struct usb_device *udev = interface_to_usbdev(intf);
int sg_supported = udev->bus->sg_tablesize != 0;
for (i = 0; i < intf->num_altsetting; i++) {
struct usb_host_interface *alt = &intf->altsetting[i];
if (uas_is_interface(alt)) {
if (!sg_supported)
return uas_isnt_supported(udev);
return alt->desc.bAlternateSetting;
}
}
return -ENODEV;
}

40
drivers/usb/storage/uas.c
View File

@ -25,6 +25,8 @@
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include "uas-detect.h"
/*
* The r00-r01c specs define this version of the SENSE IU data structure.
* It's still in use by several different firmware releases.
@ -873,44 +875,6 @@ static struct usb_device_id uas_usb_ids[] = {
};
MODULE_DEVICE_TABLE(usb, uas_usb_ids);
static int uas_is_interface(struct usb_host_interface *intf)
{
return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE &&
intf->desc.bInterfaceSubClass == USB_SC_SCSI &&
intf->desc.bInterfaceProtocol == USB_PR_UAS);
}
static int uas_isnt_supported(struct usb_device *udev)
{
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
dev_warn(&udev->dev, "The driver for the USB controller %s does not "
"support scatter-gather which is\n",
hcd->driver->description);
dev_warn(&udev->dev, "required by the UAS driver. Please try an"
"alternative USB controller if you wish to use UAS.\n");
return -ENODEV;
}
static int uas_find_uas_alt_setting(struct usb_interface *intf)
{
int i;
struct usb_device *udev = interface_to_usbdev(intf);
int sg_supported = udev->bus->sg_tablesize != 0;
for (i = 0; i < intf->num_altsetting; i++) {
struct usb_host_interface *alt = &intf->altsetting[i];
if (uas_is_interface(alt)) {
if (!sg_supported)
return uas_isnt_supported(udev);
return alt->desc.bAlternateSetting;
}
}
return -ENODEV;
}
static int uas_switch_interface(struct usb_device *udev,
struct usb_interface *intf)
{